      <div id="nav">
        <!-- skiplink anchor: navigation -->
        <a id="navigation" name="navigation"></a>
        <div id="nav_main">
          <!-- main navigation: #nav_main -->
          <ul>
            <li {{ $menu_user_group }}><a href="?controller=admin_usergroup&action=index">用户组</a></li>
            <li {{ $menu_user }}><a href="?controller=admin_user&action=index">用户</a></li>
            <li {{ $menu_roles }}><a href="?controller=admin_roles&action=index">角色</a></li>
            <li {{ $menu_permissions }}><a href="?controller=admin_permissions&action=index">权限</a></li>
            <li {{ $menu_menu }}><a href="?controller=admin_menu&action=index">菜单</a></li>
            <li {{ $menu_tools }}><a href="?controller=admin_tools&action=index">工具</a></li>
          </ul>
        </div>
      </div>